nnimap splitting weirdness

[Eric Abrahamsen <eric@ericabrahamsen.net>]

A month or so ago, all my nnimap splitting stopped working: everything
suddenly was getting sent to the default "mail.misc" group. I only just
got around to looking into what happened.

Turns out that nnimap-split-fancy is getting set to "nil" somehow, so
splitting falls back on the default value of nnmail-split-fancy -->
"mail.misc". That's pretty weird, because nnimap-split-fancy is set in
my .gnus.el file, same as always. It was definitely nil, though, and
manually re-evaluating the form where it's set made everything work
normally again.

What's weirder is that, a little later on, it was "nil" again. It's hard
to know when the value got cleared, but I had to go and manually
re-evaluate it again. I'm poking into it more right now.

Given the timing of the problem (I keep up with git head on a weekly
basis or so), and looking through the git log, I'm guessing it might be
cfa942d that is responsible, not that I have any real idea what's
happening in that commit. At least it looks like it's capable of
resetting this value!

Any hints on what might be going on? I'm using git gnus and GNU Emacs
24.3.1.

Thanks!
Eric